"So it was tremendous to offer him the chance to learn to kitesurf," Branson wrote. "The sport has really taken off in the past decade and we have the perfect conditions and team to help anyone learn. I have also wanted to learn foilboard surfing. So we decided to set up a friendly challenge: could Barack learn to kitesurf before I learned to foilboard? We agreed to have a final day battle to see who could stay up the longest."